Bifunctional luminescent superparamagnetic nanocomposites of CdSe/CdS-Fe 3O 4 synthesized via a facile method
(2012) Journal of Materials Chemistry — Vol. 22, n° 17, p. 8263-8270 (2012)
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- Abstract
- Herein, we design a facile and green method to synthesize luminescent superparamagnetic nanocomposites with a CdSe/CdS-Fe <inf>3</inf>O <inf>4</inf> structure under mild conditions. This approach was performed in the solution phase at ∼90 °C (Fe <inf>3</inf>O <inf>4</inf>) and 60 °C (CdSe/CdS). Fe <inf>3</inf>O <inf>4</inf> nanoparticles, prepared via a simple coprecipitation process, were used as seeds. A new route was designed to induce CdSe/CdS nanoparticle growth around the seeds for preparing bifunctional nanocomposites of CdSe/CdS-Fe <inf>3</inf>O <inf>4</inf>. In this approach, tri-sodium citrate plays an essential role in guiding and maintaining the structure of the nanocomposites. The fluorescence spectrum and M-H loops indicate that the bifunctional nanocomposites were synthesized successfully. It is proved that these bifunctional nanocomposites could be guided with a magnetic force for in vitro delivery into a human cancer cell line by a fluorescence microscope. The superparamagnetism and the high M <inf>s</inf> (61.78 emu g <sup>-1</sup>) of the Fe <inf>3</inf>O <inf>4</inf> nanoparticles suggest that these nanocomposites also can be used as a T <inf>2</inf> Magnetic Resonance Imaging (MRI) contrast agent. The MRI images indicate that these bifunctional nanocomposites have potential applications in diagnostics as T <inf>2</inf> MRI contrast agents. © The Royal Society of Chemistry 2012.
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Zhou, S., Chen, Q., Hu, X., & Zhao, T. (2012). Bifunctional luminescent superparamagnetic nanocomposites of CdSe/CdS-Fe 3O 4 synthesized via a facile method. Journal of Materials Chemistry, 22(17), 8263-8270. https://doi.org/10.1039/c2jm16783b (Original work published 2012)